Part circle sprinklers

ABSTRACT

A part circle sprinkler connected to a riser by a connector tube, the tube having in the upper part thereof axially extending grooves. Two omega shaped rings are loosely mounted on the upper part of the connector tube, the legs of the rings having pointed teeth for engaging the grooves. Thus, a desirable angle between the rings can readily be set.

ta tes Patent 1191 Fridberg 1451 Mar. 12, 1974 PART CIRCLE SPRINKLERS 2,877,053 3/1959 Kennard 239/230 x [751 Inventor: Jochanan Fridberg, Kibbui Nam 333221333 35133? $332232 ...::::::::1 5331538 Israel 3,581,994 6/1971 Heiberger 239/230 [73] Assignee: Naan Mechanical Works, Kibbuz Naan Israel Primary ExaminerM. Henson Wood, Jr. [22] Filed: June 8, 1972 Assistant Examiner-Michael Y. Mar [2]] pp No: 260,770 Attorney, Agent, or F1rmS1lverman & Cass [30] Foreign Application Priority Data 57] ABSTRACT June 25, 1971 Israel L. 3715l/7l 1 A part circle sprinkler connected to a riser by a con- [52] US. Cl. 239/232 nector tube, the tube having in the upper part th f [51] Int. Cl B05b'3/02 axially extending grooves Two omega Shaped rings [58] Field of Search 239/601, 230, 231, 233, arel-oosely mounted on the upper part f the connec- 239/232 tor tube, the legs of the rings having pointed teeth for engaging the grooves. Thus, a desirable angle between [56] References C'ted the rings can readily be set.

UNITED STATES PATENTS 2,928,608 3/1960 Royer 239/230 3 Claims, 4 Drawing Figures 7' 4 a a s PATENTEDW 2 I974 FIG. 2

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\ 14 I, I xii 2' I M J l x H 'i i I 1 a PART CIRCLE SPRINKLERS BACKGROUND OF THE INVENTION This invention relates to so-called part circle sprinklers, in particular to sprinklers which are mounted on ariser by means of a connector on which a bushing is rotatably mounted and terminating in a nozzle from which the spray of water is emitted.

Furthermore, on top of such a sprinkler a hammer, known per se, is mounted, controlling the rotatable movement of the bushing and thereby directing the spray into various directions. i

These sprinklers are equipped with means to limit the action of the hammer in order to restrict the area of irrigation to a certain area of the circle round the sprinkler. In that way the sprinkler will not act on predetermined areas, like roads, sport fields etc., while the remainder of the circular area will be irrigated.

The known means for limiting the area of irrigation consist of two brackets or similar devices mounted either on the connector or on ashort tube piece above it projecting'laterally from the area of the tube. These brackets can be set at a predetermined angle in correspondence to the area desired not to be irrigated. A downwardly directed arm mounted on the oscillating hammer attachment, known per se, will impinge on these brackets if the rotatory movement has brought the connector and bushing into a certain position and will prevent then the continuation of the rotatory movement of the hammer and compel the connector to rotate in the opposite direction, until the said arm impinges on.the second bracket, whereupon rotation is again reversed. In other words effective irrigation is performed only in an area lying between the said brackets wherein the arm may move freely, while that section of the circle lying between the other sides of the brackets remains without water.

' SUMMARY OF THE INVENTION The present invention improves the existing means of limiting the rotation of the sprinkler and thereby of limiting also the area to be irrigated. Moreover, it makes this operation adjustable to any limitation desired.

Two Omega-shaped rings are-loosely mounted one I above the other on the upper end of a connector tube.

Each ring can be set at any desired position. Each ring has a triangular leg portion which protrudes from the outer diameter of the connector. At a point where the leg portion of the Omega ring passes into the circular portion, a tooth is arranged being inclined to a tooth of the opposite point. The teeth are adapted to engage grooves running parallely to the axis of the connector tube. Each of the two Omega rings can be glided over the circumference of the connector tube only in one direction (clock-wise or anti-clock-wise).

SHORT DESCRIPTION OF THE INVENTION tube. These pointed teeth are slightly inclined to each other.

The whole Omega-shaped ring is made of somewhat flexible material, e.g. plastic material, so that its circular portion can be opened a bit by gripping its two legs and moving same in a direction away from each other.

However, in view of the inclination of the said teeth the whole Omega-shaped ring can be shifted rotatably about the axle of the connector tube only in one, e.g. counter clockwise, direction, while in the contrary direction it is stopped.

Thus, if two such Omega-shaped rings are. mounted on the connector tube, one above the other, their relative position on the connector tube can be changed at will by gripping one of the legs and rotatably shifting that ring in that direction where the inclined teeth may glide over the grooves of the connector tube. Thus, the setting of a predetermined angle between the two Omega-shaped rings can easily be achieved.

The downwardly directed arm of the bushing or of the hammer is apt to impinge on the legs of these Omega-shaped rings, because they protrude from the connector tube and thus correspond to the brackets known per se.

In a preferred embodiment of the invention, the connector tube is provided at its head with a flange, so as to prevent the unintentional removal of the Omegashaped rings from the area of the connector tube on which they are loosely mounted.

In accordance with another preferred embodiment of the invention, the connector tube is provided with two grooves (hereinafter called horizontal grooves) running normal to the grooves already mentioned (hereinafter called vertical grooves) and the Omega-shaped rings are provided at the inside of their circular portion with elongated protrusions adapted to engage the horizontal grooves.

The invention will be illustrated, by way of example only, in the accompanying drawings in which FIG. 1 is a cross-section and side view of the connector tube;

FIG. 2 shows the Omega-shaped ring according to one preferred embodiment of the invention;

FIGS. 3 and 4 are corresponding views of the connector tube and Omega-shaped ring according to another preferred embodiment of the invention.

The connector tube 1 is equipped as known per se with a nut 2 and has at its upper portion grooves 3 running parallel to the axis of the connector tube. An Omega-shaped ring 4 has a triangular basis called the legs 5 and is equipped with somewhat inclined teeth 6 at the portion where the legs pass into the circular por- 3' tion. These teeth are adapted to engage grooves 3 and may glide over them if the two legs 5 are somewhat separated from each other and shifted in the direction of the arrow shown in FIG. 2. The arm (not shown) extending downwardly from the bushing, is adapted to impinge on the triangular legs 5.

A second Omega-shaped ring 7 is loosely mounted on the connector tube 1 and abuts at its lower end the nut 2. A flange 8 provided at the upper end of the connector tube prevents the two Omega-shaped rings from being unintentionally removed from the connector tube.

Preferably the teeth of the second Omega-shaped I ring provided at the inner circle are inclined in an opposite direction to those of the ring 4, thus enabling a rotatable shift of the rings in opposite'direction In the embodiment shown in FIG. 3 and 4, the connector tube 1 with nut 2' has also has an upper part with vertical grooves 3, but in addition thereto two horizontal grooves 9 and 9' are provided and spaced from each other by at least the diameter of one Omegashaped ring. The Omega-shaped ring 4 with its triangular legs 5' and teeth 6' conforms in all details to that shown in FIG. 3, but in addition thereto is provided with small protrusions 10, at the inside of the circular portion. In the example they extend only over a part of the inner circle of the ring and lie opposite to each other. They are so shaped as to engage grooves 9 or 9, thus securing their position on the connector tube, without interfering with their capability to be shifted around that tube to predetermined angles between each other.

I claim:

1. A device for a part circle sprinkler, said device including a connector tube by which the sprinkler is connected to a riser, said connector tube comprising in the upper part thereof axially extending grooves, said device further including two Omega-shaped rings, made of flexible, e.g. plastic, material, both being loosely mounted one above the other on the upper part of the connector tube, the legs of each ring protruding from the outer diameter of the connector tube and having small pointed teeth in the area where the legs pass into the circular portion of the ring, said teeth being adapted to engage said grooves on the connector tube, the teeth being slightly inclined to each other.

2. A device for part circle sprinklers, as claimed in claim 1, wherein the connector tube is provided at its head with a flange.

3. A device for part circle sprinklers, as claimed in claim 1, wherein the connector tube is provided with horizontal grooves and the rings are provided at the inside of their circular portions with elongated protrusions adapted to engage the horizontal grooves. 

1. A device for a part circle sprinkler, said device including a connector tube by which the sprinkler is connected to a riser, said connector tube comprising in the upper part thereof axially extending grooves, said device further including two Omega-shaped rings, made of flexible, e.g. plastic, material, both being loosely mounted one above the other on the upper part of the connector tube, the legs of each ring protruding from the outer diameter of the connector tube and having small pointed teeth in the area where the legs pass into the circular portion of the ring, said teeth being adapted to engage said grooves on the connector tube, the teeth being slightly inclined to each other.
 2. A device for part circle sprinklers, as claimed in claim 1, wherein the connector tube is provided at its head with a flange.
 3. A device for part circle sprinklers, as claimed in claim 1, wherein the connector tube is provided with horizontal grooves and the rings are provided at the inside of their circular portions with elongated protrusions adapted to engage the horizontal grooves. 